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Glossary 667
1st ed., 6/30/04 - 312579601
See also Cartridge Access Port, standard CAP,
enhanced CAP, priority CAP, WolfCreek CAP, or
WolfCreek optional CAP.
TP— Tape-to-Print.
transaction— A short series of actions with the
control data set. These actions are usually related to a
specific function (e.g., Mount, ENter).
transport— An electromechanical device capable of
threading tape from a cartridge, moving the tape
across a read/write head, and writing data onto or
reading data from the tape.
TREQDEF— An HSC command that is used to load
the definition data set that contains TAPEREQ
control statements.
Tri-Optic label— An external label attached to the
spine of a cartridge that is both human and machine
readable.
TT— Tape-to-Tape.
U
unit affinity— A request that all cartridges be
mounted on a single drive (either for read or write
purposes), usually to reduce the number of drives
needed for a job.
unit parameter value— A JCL term meaning the
value of a JCL UNIT parameter. The value can be a
single address of a drive, an esoteric list, or a generic
list.
UNITATTR— An HSC control statement that is
contained in the definition data set specified by the
UNITDEF command— A UNITATTR statement
defines to the HSC the transport’s media type and
recording technique capabilities.
UNITDEF— An HSC command that is used to load
the definition data set that contains UNITATTR
control statements.
utilities— Utility programs. The programs that allow
an operator to manage the resources of the library
and to monitor overall library performance.
V
VA R — See Volume Attribute Record.
VAT — See Volume Attribute Table Entry.
Virtual Storage Manager (VSM)— A storage
solution that virtualizes volumes and transports in a
VTSS buffer in order to improve media and transport
use.
Virtual Tape Control System (VTCS)— The
primary host code for the Virtual Storage Manager
(VSM) solution. This code operates in a separate
address space, but communicates closely with HSC.
Virtual Tape Storage Subsystem (VTSS)— The
DASD buffer containing virtual volumes (VTVs) and
virtual drives (VTDs). The VTSS is a StorageTek
RAID 6 hardware device with microcode that
enables transport emulation. The RAID device can
read and write “tape” data from/to disk, and can read
and write the data from/to a real tape drive (RTD).
virtual thumbwheel— An HSC feature that allows
read-only access to a volume that is not physically
write-protected.
VOLATTR— An HSC control statement that is
contained in the definition data set specified by the
VOLDEF command. A VOLATTR statement defines
to the HSC the media type and recording technique
of the specified volumes.
VOLDEF— An HSC command that is used to load
the definition data set that contains VOLATTR
control statements.
VOLSER— A six-character alphanumeric label
used to identify a tape volume.
volume— A data carrier that is mounted or
dismounted as a unit. (See cartridge).
Volume Attribute Record (VAR)— An HSC
internal record that contains the data base-resident
information of a cartridge entered into the library.
Volume Attribute Table Entry (VAT)— An HSC
internal table that contains entries to the intransit
record token and the Volume Attribute Record
(VAR). The VAT is used as the communications area
for internal service calls.
W
WolfCreek (9360) LSM— A smaller capacity
high-performance LSM. WolfCreek LSMs are